Construction Precast Development
Precast News From China
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On March 30th, the Wuhan Natural Resources and Urban Rural Development Bureau announced that after verification, 10 pre mixed concrete production enterprises had abnormal professional contracting qualifications and did not meet relevant qualification standards and management regulations.
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Among the types of concrete cracks, structural cracks (such as penetrating settlement cracks, load cracks, and large volume hydration heat cracks) are the most dangerous, with a width often exceeding 0.
5 millimeters and a depth penetrating the component, directly threatening the structural bearing capacity and overall stability.
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The common types of cracks in concrete pouring mainly include plastic shrinkage cracks, temperature cracks, drying shrinkage cracks, settlement cracks, hydration heat cracks, and stress concentration cracks, among which plastic shrinkage and temperature cracks are the most common in the early stages of construction.
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In 2025, under the dual background of supply and demand structure adjustment and green transformation, the ready mixed concrete industry in Guizhou Province will focus on stabilizing growth, improving quality, and promoting transformation.
It will face core challenges such as overcapacity, low price competition, and financial pressure, steadily promote the standardized, green, and intelligent development of the industry, and provide solid building materials support for major infrastructure, urban renewal, rural revitalization, and livelihood projects in the province.
The report on the development of industries in the province in 2025, the effectiveness of work promotion, existing problems, and work suggestions for 2026 is as follows:.
The rebound instrument was invented by Swiss scientist Schmidt in 1950.
The rebound instrument has a relatively simple structure and is small in size and light in weight, which makes it convenient to carry and has a fast testing speed.
This equipment received attention from relevant personnel in China in the 1950s, and it was not until the 1980s that this method began to be widely used for testing the strengthening of concrete.
During the experimental process, relevant theories were continuously summarized and its related content was improved.
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All steel pipe columns in this project have an outer diameter between 1200mm and 1800mm, which is a prerequisite for manual vibration.
Taking the 1200mm diameter as an example, the specific internal situation of the steel pipe is described as follows:.
The strength of concrete is the basic guarantee for the structural safety of building products, and it is also a problem that construction workers often face.
However, due to a deviation in understanding the standards, there are still errors in their application and inference in actual construction production.
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There are errors in some clauses of the national standard GB/T 50082-2024 “Test Methods for Long term Performance and Durability of Concrete”.
After verification and confirmation by the chief editor, the relevant content has been modified.
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With the rapid development of the construction industry, ready mixed concrete has become an indispensable material for modern construction due to its excellent performance.
However, in practical applications, quality issues with ready mixed concrete often occur, which not only affect the safety and durability of buildings, but also bring huge economic losses to construction units.
Therefore, studying the quality management of ready mixed concrete is of great significance.
This article aims to explore in depth the key issues in the production, raw material control, production process management, and quality inspection of ready mixed concrete, and propose effective quality management strategies, in order to provide useful references for the quality management of construction projects.
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Adding antifreeze in winter concrete construction has the advantages of simple construction, energy saving, saving concrete construction costs, and improving the quality of winter concrete construction.
A good antifreeze agent can help concrete reach its critical strength for freezing as soon as possible, ensuring that the liquid phase in the concrete does not freeze or freezes less at negative temperatures; It can hydrate cement and increase the strength of concrete normally after curing at negative to positive temperatures.
The development of antifreeze has gone through several stages in terms of composition, including chloride salt type, chloride salt rust inhibitor type, chlorine free high alkali type, and chlorine free low alkali type.
Among them, chloride salt antifreeze is not allowed to be used in reinforced concrete and prestressed concrete structures.
Antifreeze products generally contain water reducing components, early strength components, antifreeze components, and air entraining components.
The principle is to reduce the water consumption of concrete, improve the early strength of concrete as soon as possible, and prevent concrete freezing damage under negative temperature.
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